Lifted this from CKC mag
Grade Properties
1xxx excellent formability,weldability & corrosion resistance.low strength
2xxx excellent machinability & high strength.poor formability,weldability
& corrosion resistance
3xxx formable,corrosion resistant & weldable.moderate strength
4xxx formable,weldable,corrosion resistant
5xxx formable,weldable,excellent corrosion resistantance
6xxx good formability,weldability & corrosion resistance.medium
strength,heat treatable
7xxx machinable with high strength.poor corrosion resistance
& weldability
8xxx excellent formability
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